PNP and NPN Oscillator (MSB120E)

This traditional oscillator uses two complementary transistors to produce low frequency signals. The signals can be converted in sound if a loudspeaker is used to replace R3. Any 3 to 16 ohm loudspeaker can be used. R1 can be also replaced by a potentiometer to control the frequency. The circuit can be powered from 1,5 to 12 V sources.

 


 

 

 


 

 

 

To download the simulation files and Netlist - click here (msb0120.zip)

Triangular Square Oscillator (MSB118E)

This circuit uses in operational amplifier to produce square and triangular low frequency signals. Frequency is given by the capacitor and the symmetry adjusted by the potentiometer. Power supply must be dual and other operational amplifiers can be used. The diodes are general purpose silicon types such as the 1N914 or 1N4148.

 


 

 

 


 

 

 

To download the simulation files and Netlist - click here (msb0118.zip)

Triggered Oscillator 555 (MSB119E)

This circuit shows how to control an astable configuration using the 555 IC. The control signal is produced by the function generator (1 to 10 Hz) and the main signal (square) is determined by the 47 nF capacitor and the 10k resistor. These components can be changed. In the figures below we have the wave shape displayed by virtual oscilloscope of the MultiSIM and also pinout for the 555.

 


 

 

 


 

 

 


 

 

 

To download the simulation files and Netlist - click here (msb0119.zip)

Twin-T Oscillator using the TL051 NE108 (MSB117E)

Twin-T oscillator are a good solution for the production of low-frequency sinusoidal signals. The circuit show in figure 1 can be powered from voltages sources starting from 6 V (dual) and is adjusted by the trimpot. See in the section Mathematics for Electronics how to calculate the elements of the twin-T for a desired frequency.

 

 


 

 

 


 

 

 

To download the simulation files and Netlist - click here (msb0117.zip)


Circuit Bench